Brucellosis Surveillance Raffle Info

Background

Brucellosis is a bacterial disease primarily of Rocky Mountain elk and bison. The disease is limited to northwestern Wyoming and adjoining portions of Montana and Idaho. Cows often abort their first fetus after becoming infected. Abortions may occur in subsequent pregnancies but diminish over time. Thediseaseis transmittedtootherwildlifeandcattlethroughcontactwith these infectedabortedfetuses. The disease does not affect bull reproduction; however infection may result in inflammation of the testes (orchitis). Brucellosis also infects domestic cattle. A state/federal eradication program has almost eliminated the disease in cattle, but infected elk and bison pose a continuing threat. Each year the Wyoming Game and Fish Department monitors the distribution of brucellosis within the state’s elk populations by requesting hunters to collect blood samples from their harvested animal. Surveillance is generally concentrated in elk herds that surround, but do not use state or federal feedgrounds. Nearly a quarter of the state is surveyed each year, eventually providing coverage over the entire state. Elk of the GYE (Greater Yellowstone Ecosystem) that do not utilize feedgrounds have an average prevalence of 20%, yet there is no evidence that brucellosis has noticeable impacts on populations. The primary management concern is the possible transmission of brucellosis from elk or bison to domestic cattle.

Approximately 11,000 blood collection kits are assembled and mailed to hunters successful in acquiring limited quota elk licenses within target surveillance areas. Over the past 5 years, an average of 32% of those successful hunters who were selected to participate in our surveillance effort returned a blood sample from their harvested animal. Of those returned samples, an average of 60% were deemed useable/testable. Elk hunt areas for the 2018 targeted surveillance can be found on the interactive brucellosis map. Not all hunters possessing a license for those areas will receive a kit.

Entering the Brucellosis Surveillance Raffle

In an effort to recognize hunter’s contributions to brucellosis monitoring and encourage more participation in this program, the department is holding a raffle. Hunters will be entered into the raffle by returning a useable blood sample and a completed data card from the blood kit that they received via mail or handout. The raffle is limited to those hunting in an areas included in this year's targeted surveillance. Hunters that successfully draw multiple tags, and receive multiple kits, will be entered for each kit returned. The raffle drawing will be held in March 2019. Increasing our sample size can provide more statistically powerful estimates of brucellosis prevalence at finer scales (e.g., Hunt Area vs. Herd Unit) and further help WGFD and researchers understand spread, prevalence, and possibly management actions that control brucellosis.

Thanks to our partners, whose donations are greatly appreciated, and who this raffle couldn't be possible without. Thanks also to all the hunters whose participation is critical to the surveillance of brucellosis in free ranging elk in Wyoming. Good luck with your hunt and the raffle!